// license:BSD-3-Clause
// copyright-holders:Miodrag Milanovic
/***************************************************************************
Generic 8bit and 16 bit latch devices
***************************************************************************/
#pragma once
#ifndef MAME_DEVICES_MACHINE_GEN_LATCH_H
#define MAME_DEVICES_MACHINE_GEN_LATCH_H
//**************************************************************************
// DEVICE TYPE DECLARATIONS
//**************************************************************************
extern const device_type GENERIC_LATCH_8;
extern const device_type GENERIC_LATCH_16;
//**************************************************************************
// INTERFACE CONFIGURATION MACROS
//**************************************************************************
#define MCFG_GENERIC_LATCH_8_ADD(_tag) \
MCFG_DEVICE_ADD(_tag, GENERIC_LATCH_8, 0)
#define MCFG_GENERIC_LATCH_16_ADD(_tag) \
MCFG_DEVICE_ADD(_tag, GENERIC_LATCH_16, 0)
#define MCFG_GENERIC_LATCH_DATA_PENDING_CB(_devcb) \
devcb = &generic_latch_base_device::set_data_pending_callback(*device, DEVCB_##_devcb);
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> generic_latch_base_device
class generic_latch_base_device : public device_t
{
protected:
// construction/destruction
generic_latch_base_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, u32 clock, const char *shortname, const char *source);
public:
// static configuration
template<class _Object> static devcb_base &set_data_pending_callback(device_t &device, _Object object) { return downcast<generic_latch_base_device &>(device).m_data_pending_cb.set_callback(object); }
DECLARE_READ_LINE_MEMBER(pending_r);
protected:
virtual void device_start() override;
virtual void device_reset() override;
bool is_latch_written() const { return m_latch_written; }
void set_latch_written(bool latch_written);
private:
bool m_latch_written;
devcb_write_line m_data_pending_cb;
};
// ======================> generic_latch_8_device
class generic_latch_8_device : public generic_latch_base_device
{
public:
// construction/destruction
generic_latch_8_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
DECLARE_READ8_MEMBER( read );
DECLARE_WRITE8_MEMBER( write );
DECLARE_WRITE8_MEMBER( preset_w );
DECLARE_WRITE8_MEMBER( clear_w );
DECLARE_WRITE_LINE_MEMBER( preset_w );
DECLARE_WRITE_LINE_MEMBER( clear_w );
void preset_w(u8 value) { m_latched_value = value; }
protected:
virtual void device_start() override;
void sync_callback(void *ptr, s32 param);
private:
u8 m_latched_value;
};
// ======================> generic_latch_16_device
class generic_latch_16_device : public generic_latch_base_device
{
public:
// construction/destruction
generic_latch_16_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
DECLARE_READ16_MEMBER( read );
DECLARE_WRITE16_MEMBER( write );
DECLARE_WRITE16_MEMBER( preset_w );
DECLARE_WRITE16_MEMBER( clear_w );
DECLARE_WRITE_LINE_MEMBER( preset_w );
DECLARE_WRITE_LINE_MEMBER( clear_w );
void preset_w(u16 value) { m_latched_value = value; }
protected:
virtual void device_start() override;
void sync_callback(void *ptr, s32 param);
private:
u16 m_latched_value;
};
//**************************************************************************
// TEMPALTE INSTANTIATIONS
//**************************************************************************
extern template class device_finder<generic_latch_8_device, false>;
extern template class device_finder<generic_latch_8_device, true>;
extern template class device_finder<generic_latch_16_device, false>;
extern template class device_finder<generic_latch_16_device, true>;
#endif // MAME_DEVICES_MACHINE_GEN_LATCH_H